It's fun to speculate about what UA may or may not do in terms of fleet expansion, but if you know for a fact (e.g. you have heard something from a credible UA source) about what UA plans to do--please state that.

The 7E7 is not a replacement for the 767--if it was, Boeing would not build them simultaneously. And I just can't see a 330 entering their fleet given the company's dedication to the 777. But these are just opinions...like most of what's been posted already.